Guillermo Olaso defeated Guillermo Alcorta Olarra 7-6 6-1 in the France F12 qualifying round on clay. Guillermo Olaso extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-11-03 | Spain F42 | R16 | hard | Guillermo Alcorta Olarra | 7-5 6-1 |
| 2007-11-05 | Spain F40 | R16 | hard | Guillermo Olaso | 3-6 6-1 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.